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html2bbcode: use headings bbcode for headings

anaqreon/hubzilla,mrjive/hubzilla,anaqreon/hubzilla,anaqreon/hubzilla,anaqreon/hubzilla,dawnbreak/hubzilla,dawnbreak/hubzilla,sasiflo/hubzilla,dawnbreak/hubzilla,dawnbreak/hubzilla,mrjive/hubzilla,mrjive/hubzilla,redmatrix/hubzilla,redmatrix/hubzilla,anaqreon/hubzilla,redmatrix/hubzilla,sasiflo/hubzilla,redmatrix/hubzilla,dawnbreak/hubzilla,anaqreon/hubzilla,sasiflo/hubzilla,mrjive/hubzilla,sasiflo/hubzilla,mrjive/hubzilla,redmatrix/hubzilla,mrjive/hubzilla,redmatrix/hubzilla,dawnbreak/hubzilla,sasiflo/hubzilla,sasiflo/hubzilla